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    dl  定义列表
    dt   定义专业术语或名词
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   <dl>
      <dt>HTML</dt>
      <dd>超文本标记语音</dd>

      <dt>CSS</dt>
      <dd>层叠样式</dd>

      <dt>JvaScript</dt>
      <dd>动态脚本语言</dd>

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